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The geological structure is complex in the Hohhot-Baotou area.Several earthquakes with MS≥6.0 have occurred in the area in history.This article selected the Hohhot-Baotou area as the study region and divided it into 2 sub-regions,each with a spatial scope of 3°×2°,according to the spatial distribution of ML≥1.0 earthquakes occurring between January 2001 and April 2010,and the layout of the seismic network in the study region.Average velocity ratios of respective sub-regions were calculated,and comparative analysis was made on their temporal and spatial variations.Results show that there are slight differences between sub-regions in the variation amplitude of average velocity ratio curves over time,which mostly remains between 2.5% to 2.584%.In the Hohhot area,the average velocity ratio is 1.722,significantly lower than the average velocity ratio of 1.733 in the Baotou area.We preliminarily concluded that this was related to the distribution of fault structures and properties of underground media in the Hohhot area.
The geological structure is complex in the Hohhot-Baotou area. Earth earthquakes with MS ≥6.0 have occurred in the area in history. This article selected the Hohhot-Baotou area as the study region and divided it into 2 sub-regions, each with a Spatial scope of 3 ° × 2 °, according to the spatial distribution of ML ≥ 1.0 earthquakes occurring between January 2001 and April 2010, and the layout of the seismic network in the study region. Average velocity ratios of each sub-regions were calculated, and comparative analysis was made on their temporal and spatial variations. Results show that there are slight differences between sub-regions in the variation amplitude of average velocity ratio curves over time, which mostly between between 2.5% to 2.584% .In the Hohhot area, the average velocity ratio is 1.722, significantly lower than the average velocity ratio of 1.733 in the Baotou area. We preliminarily certify that this was related to the distribution of fault structures and properties of underground media in the Hohhot area.